An MBA (Macbook Air) is configured with High-Sierra. It was bought and configured with a relatives Apple ID. I inherited the MBA: the iCloud account is set to my Apple ID. When trying install Apple updates, both Apple IDs do not work. Why is this and what is the remedy?
I would like my Apple ID to be authoritative to enable updates from Apple. What would need to be done?
Update: no apps are downloaded from the Apple store.